commit c6e3f520c802c5cb2de80576aba7f9f1fe985d8b
author Kevin Wolf <kwolf@redhat.com> Fri Mar 22 13:53:03 2019 +0100
committer Kevin Wolf <kwolf@redhat.com> Tue Mar 26 11:37:51 2019 +0100
tree e0eb9617785eb3ee5cb9179e2b01675426dc1146
parent c9fdcf202f19fc2acdcb1ee0522ff5d61bf8c906

qemu-io: Add write -n for BDRV_REQ_NO_FALLBACK

This makes the new BDRV_REQ_NO_FALLBACK flag available in the qemu-io
write command.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Eric Blake <eblake@redhat.com>

qemu-io-cmds.c

diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 35dcdcf..09750a2 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -946,6 +946,7 @@
 " -b, -- write to the VM state rather than the virtual disk\n"
 " -c, -- write compressed data with blk_write_compressed\n"
 " -f, -- use Force Unit Access semantics\n"
+" -n, -- with -z, don't allow slow fallback\n"
 " -p, -- ignored for backwards compatibility\n"
 " -P, -- use different pattern to fill file\n"
 " -C, -- report statistics in a machine parsable format\n"
@@ -964,7 +965,7 @@
     .perm       = BLK_PERM_WRITE,
     .argmin     = 2,
     .argmax     = -1,
-    .args       = "[-bcCfquz] [-P pattern] off len",
+    .args       = "[-bcCfnquz] [-P pattern] off len",
     .oneline    = "writes a number of bytes at a specified offset",
     .help       = write_help,
 };
@@ -983,7 +984,7 @@
     int64_t total = 0;
     int pattern = 0xcd;
 
-    while ((c = getopt(argc, argv, "bcCfpP:quz")) != -1) {
+    while ((c = getopt(argc, argv, "bcCfnpP:quz")) != -1) {
         switch (c) {
         case 'b':
             bflag = true;
@@ -997,6 +998,9 @@
         case 'f':
             flags |= BDRV_REQ_FUA;
             break;
+        case 'n':
+            flags |= BDRV_REQ_NO_FALLBACK;
+            break;
         case 'p':
             /* Ignored for backwards compatibility */
             break;
@@ -1037,6 +1041,11 @@
         return -EINVAL;
     }
 
+    if ((flags & BDRV_REQ_NO_FALLBACK) && !zflag) {
+        printf("-n requires -z to be specified\n");
+        return -EINVAL;
+    }
+
     if ((flags & BDRV_REQ_MAY_UNMAP) && !zflag) {
         printf("-u requires -z to be specified\n");
         return -EINVAL;